≤

Definition: ≤

If [math]A [/math] and [math]B [/math] are sets, then [math]|A| ≤ |B| [/math] means that there exists an injection [math]f : A \href{/cs2800/wiki/index.php/%E2%86%92}{→} B [/math]

The LaTeX symbol for ≤ is \leq.